189 entries under adjective topic. ×

2
unbending(strong, hard, tough, firm)
2
ungiving(firm, unyielding)
2
unrelenting(strong, hard, tough, severe)
1
X-rated(offensive, dirty, coarse, vulgar)
1
affectionate(close, correct, firm, honest)
1
allegiant(close, correct, firm, honest)
1
astringent(strong, hard, tough, severe)
1
attached(close, correct, firm, honest)
1
austere(strong, hard, tough, severe)
1
authoritarian(strong, hard, tough, severe)
1
behind one(expression, close, correct, firm)
1
bitter(strong, hard, tough, severe)
1
bullheaded(strong, hard, tough, severe)
1
by the book(expression, idiom, strong, hard)
1
ceaseless
1
chronic
1
circumspect(close, correct, firm, honest)
1
confiding(close, correct, firm, honest)
1
confirmed
1
conscientious(close, correct, firm, honest)
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APASmart Define. (2016). hard-core thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/hard-core/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-core thesaurus" https://smartdefine.org/hard-core/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, hard-core thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/hard-core/thesaurus/synonyms>.
MLASmart Define. "hard-core thesaurus" 28 March 2016. Web. 26 September 2026. <https://smartdefine.org/hard-core/thesaurus/synonyms>